I'm not sure there is a water to fan ratio. I am on well water and that combined with 35 year old galvanized water pipes makes for some rusty water out at the garage. I had a couple rhinos that were doing the same thing as Robert's. Two of them went to Florida and never showed any signs of it again. I have a sub adult rhino and one of my hatchling's I held back do the same thing. It seems to show up whenever I use the outside water facet and don't let it run for 10-15 minutes before. Thus I have a feeling it was due to the metals in the water from the pipes and maybe the well water. The fan is just for air circulation, just to keep the air circulating as I keep humidity around 70%. What's weird is I have 3 yearling rhinos housed together and only the one was showing signs. I have a gut feeling my problem was due to the water. Fan help?? but it is a good thing with the higher humidity's. I think I have rambled and lost my train of thought. Let me know if you have any other questions

Jacob

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